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x/fun/mod.ts>async_either.join

A collection of algebraic data types, lenses, and schemables based on a light weight higher kinded type implementation. Written for deno.
baetheus/fun
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function async_either.join
import { async_either } from "https://deno.land/x/fun@v2.0.0-alpha.6/mod.ts";
const { join } = async_either;

Flatten a AsyncEither wrapped in a AsyncEither

import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
import * as TE from "./async_either.ts";
import * as E from "./either.ts";
import { pipe } from "./fn.ts";

const ta = pipe(
  TE.of(1),
  TE.map(n => TE.of(n*2)),
  TE.join,
  TE.chain(n => TE.of(n**2))
)

assertEquals(await ta(), E.right(4))